A student wants to project the image of a candle flame on a screen 90 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole a) suggest the type of mirror he should use b) determine the linear magnification in the case c) find the distance between the object and its image

a) A concave mirror is a mirror used by him

b) Distance of the object u = -15cm

The distance of the image v = -60cm

Therefore magnification = – image distance/object distance

= -v/u

= -(-60cm)/(-50cm) = -4 which is the linear magnification of the image

c) Distance between the object and image = distance of screen from pole of mirror – distance of object from pole to mirror

= B’P – BP = 60cm – 50cm = 45cm

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